Picked up flat stitch in bride's clothing (9)

I believe the answer is:

trousseau

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'clothing' is the definition.
(trousseau is a kind of clothing)

I don't understand the remainder of the clue.

(Other definitions for trousseau that I've seen before include "Bridal outfit" , "Bridal accessories" , "not top-drawer stuff" , "All that a bride needs!" , "A bride's collection of clothing" .)

I've seen this clue in The Telegraph.

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